Ground connection



Aug. 6, 1929.

` G. E. ALLEN GROUND CONNECTION Filed June 14, 1928 Patented Aug. 6, 1929.

UNITED STATES GEORGE E. ALLEN, OF BUFFALO, NEW YORK.

` GROUNI) CONNECTION.

Application filed .Tune 14,

In the grounding of electric circuts a damp connection is superior and pre l erable to a dry connection. There'fore the present invention ains to provide means whereby a ground connection may be maintained in a damp condition so as to obtain the best possible results, particularly in the grounding of radio frequeney circuits.

While the drawing illustrates a preferred enbodiment of the invention, it is to be understood that in adapting the means to meet specific needs and requirements, the design may be varied and such other changes in the ninor details of the invention as claimed, without departing from the spirit thereof.

For a full understanding of the invention and the nerits thereof, reference is to be had to the following description and the drawing hereto attached, in which Figure l is an elevational View of a grounding strip of sheet metal having marginal portions separated by inclined outs.

Figure 2 is a sectional View of the device, the grounding strip being disposed to present its edge.

Figur-e 3 is a horizontal sectional View on the line 3-3 of Figure 2.

Figure 4 is a detail View of portion of the device and the clamp whereby it may be attached to a water pipe.

Figure 5 is an end view of the clamp as applied to a water pipe, the latter being in section.

Corresponding and like parts are referred to in the following description and designated in the several views of the drawing by like reference characters.

The numeral 1 denotes a strip of sheet metal which may be of any lengtl' and Width. An end portion of the sheet metal strip 1 is reduced as ndicated at 2 to provide a projecting part for the attachment thereto ofthe wire to be grounded.

Slits or outs 3 are formed in opposite marginal edges of the strip l and incline inwardly and downwardly from the edgesof the strip. In the preferable arrangement the slits or cuts in opposite edge portions of the strip coincide and are reversely inclined. The part s separated by the inclined cuts 3 form tongues 4: which are bent laterally, the tongues along one edge being bent in the same direction and opposite to the tongues along the other edge of the strip. The strip thus formed presents the appearanee substantally as shown i F gures 2 and 3 a d is 1928. Serial No. 285343.

pressed into a tube 5 of suitable length and diameter. The pointed ends of the tengues 4: positively engage the inner wall oi? the tube 5 thcreby assuring an electric connection. V I i lhe number o tongues 4 results in the provision of a plurality of contacts thereby assuring positive electrical connectio' between the strip 1 and tube or casing 5. closures are fitted to the ends of the tube or casing 5 to prevent loss of water supplied thereto by evaporation or otherwise. A plate 6 is shown closing one end of the tube and an opening is formed therein in which .is litted a plug 7. A suitable fitting 8 is applied to the opposite or lower ends of the tube 5 and may be connected to a water pipe or fixture in any determinate way.

hen the grounding strip 1 is properly positioned within the tube or casing 5 the latter is supplied with water and is closed. The projeeting end portion 2 of the strip is adapted to have the Wire to be grounded connected thereto in any manler.

For conneeting the device to a Water pipe a clanp has been devised and compriscs similar parts 9 and 10 which are shaped to fit about a pipe 11 as indicated most clearly in Figur-e 5 of the drawing. The grippi'g faces of the members comprising the clanp are toothed or serrated to preventslippin Apei'tured cars 12 project :from opposite longtudinal edges of the parts comprisng the clamp and receive bolts 13 hy means of which the clanp is Secured upon the pipell :in the desired position. One of the members of the clamp as 10 is 'formed with the project-lon 14: in which is formed a threaded socket to receive the threaded end of the fitting 8 as .shown most clearly in Figure 4; of the drawing. When connecting the device to a radiator or other fixture a suitable fitting may be coupled to the part 8 to admit of the device occupying a vertical position when connected to the fixture or part to which it is applied.

A bolt 15 and cooperatinp nut and Washer are shown as means for connecting the wi'e to be grounded to the projecting end 2 of the stri 3 1.

aving thus described the invention, I claim 1. An electric grounding device comprising a metal strip provided along opposite edges with tongues which form contact elements.

2 An electrie grounding devioe including suitable' u metal strip having portions partly severed from opposte edges and bent laterally in opposite directions to provide a plurality of Contacts 3. An electrie grounding device including e sheet metal strip having inwardly extending cuts along its marginal edges and having the portions separated by the euts bent laterzlly to provide a plurality of contact points.

4. An electrie grounding deviee including a czsing adapted to contain water and a strip thcrein immersed in the water and provided with a plurality of points eleetrically connected with the inner wall of the casing.

5. An electric grounding deviee eomprising a closed casing and a grounding member therein provided with a plurality of points electrieally engaging the inner wall of the casing the letter adzipted to receive water to insure a damp connection.

(i. An eleetrie grounding device comp'ising a casing ndepted to eontnin water, n u grounding member thei-ein innnersed in the water and provided with u pln'lity of pointselectrically connected with the cesing.

7. An electric gronnding device eonprisinr ;i casing ndapted to contain water :I grounding member thei-ein and n clnmp for conneeting the casing to the water pipe such clamp comprising complemental members having ofi standing apertured elements to receive eonnecting bolts and one of the clamp members having a projeetion to which the easing is fitted.

In testimony whereof I afix my signature.

GEORGE E. ALLEN. [n 5. 

